Method of producing coal-tar paint



tar from 160 F. to 180 or 19 .of high volatile content. placed in. a suitable still in which it is subby the injectionraised very slowly to a UNITED STATES PATENT OFFICE.

- IIERNAND GEO. WHITE, 0]! MEBIDEN, CONNECTICUT;

METHOD OF PRODUCING COAL-TAR PAINT.

' Ho Drawing.

T 0 all whom it may concern:

Be it known that I, FERNANI) G. WHITE, a citizen of the United States, residing at -M eriden, in the county of New Haven and State of Connecticut, have and useful Improvement in Methods of 'Producing'Coal-Tar Paint; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to. an improved method of producing, from the raw coal tar derived from the distillation of gascoals,

'or coals of high. volatile content, a paint particularly designed for use in dressing cloth or leather automobile tops, but also adapted tobe used for kindred purposes, the object being to produce, at a low cost, a

dressing of superior flexibility, preserving.

quality, and'permanence, as well as providing an attractive finish, whereby faded tops ma be restored to a fine appearance.

1 i1 carrying out my invention, I take, a quantity of the raw coal tar resulting from the distillation of what is known in the market as gas coals, .which are coals The raw tar is jected to constant agitation, of air or by some mechanical stirring apparatus, the agitation of the tar tinued throughout the process. Heat is applied under the container of the still and the tar gradually heated until it reaches a temperature of substantially 160 F. At this temperature, the water content of the tar will begin to be discharged from the coil of the still. The temperature of the still is now temperature of substantially 180 F. and may evenbe raised to 190 F. Particular care should betaken to raise the temperature of the tar in the container from 160 F. to 180 F. or more very K since otherwise the tar willboil over discharged through theroil wlth the At least one h slowly, and be condensed water. be allowed for raising our should the temperature of the F. The still.

should thereafter be run at a temperature of 180 F. .to 190 F, until the emulsion which comes from the coil is about three parts of light tar oil to one part of water. The temperatureof the still isnow slowl raised untilja temperature of substantia ly'310 F. is reached; this temperature should not exceed 325 F. or thereabout, since above this temperature the heavy oil will begin to go invented a new a being conwater oil has been removed.

r o at a Patented Nov. 8, 1921. Application filed August 19, 1821. Serial No. 493,725.

ing substantially all of the heavy tar oil in the tar, but the ammoniacal content of the raw tar is driven off during'the described distillmg opera'tlon, so that substantially no ammonia remains in the dehydrated tar in the container of the still.

The fire is now drawn and the tar remaining in the container allowed to cool to a temperature of from 100 to 125 F., the object being to keep the tar fluid enough to be read ily. stirred, but not hot enough to cause explosions.

Practically all the tar oil which passes off with.the water during the operation described is lighter than water, though very small uantities of heavier-than-water 011 may come over with the water and lighter 011, depending on the raw tar used and on the temperatures reached during the distilling operation. Such lighter-than-wat'er tar oil is then poured into the dehydrated tar remaining in the container and stirred into ituntil the entire body of tar is reduced to the consistency of thin paint. It is to be understood, however, that the amount of light tar oil produced from the distillation of any given volume of raw tar will not be sufiicient to thin the dehydrated tar in the container to the consistency of paint, but other light tar oil must be added to the amount driven ofli during the distillation of any given amount of tar. I mighthere explain that any tar oil. lighter than water may be used in this thinning operation.

The paint produced by the above processtures'h'erein given, my invention consisting broadly in a rocess characterized by adding the lighteran-water tar oil to coal tar, from which the water and lighter-than- I claim: 1. An improved method of producin an elastic, preservative dressing for 0 0th,

-tar' oil lighter than Water.

-.from the coil 'water and three parts of lighter-than-water oil, thencont nuing the process leather and kindred materials, consisting in distilling raw coal tar to drive 'ofl' its Water and lighter-than-water oil, then cooling the dehydratedtar and reducing it to the thinness of paint by the addition to it of 2. n improved method of producing an preservative dressing for cloth, leather andkindred materials, consisting in placing raw coal tar in a still and raising it to the temperature at which the discharge is substantially one part of of distillacient amount of tar oil lighter than water to reduce the consistency of the mass to that of thin pamt.

n testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FERNAND GEO. WHITE.- Witnesses: y

EMMA A. WHITE, EARL F..Wmrn.

1811 arresting the 

